public static function FileItem::validateExtensions in Drupal 10

Same name and namespace in other branches

1. 8 core/modules/file/src/Plugin/Field/FieldType/FileItem.php \Drupal\file\Plugin\Field\FieldType\FileItem::validateExtensions()
2. 9 core/modules/file/src/Plugin/Field/FieldType/FileItem.php \Drupal\file\Plugin\Field\FieldType\FileItem::validateExtensions()

Form API callback.

This function is assigned as an #element_validate callback in fieldSettingsForm().

This doubles as a convenience clean-up function and a validation routine. Commas are allowed by the end-user, but ultimately the value will be stored as a space-separated list for compatibility with file_validate_extensions().

File

core/modules/file/src/Plugin/Field/FieldType/FileItem.php, line 225

Class

FileItem

Plugin implementation of the 'file' field type.

Namespace

Drupal\file\Plugin\Field\FieldType

Code

public static function validateExtensions($element, FormStateInterface $form_state) {
  if (!empty($element['#value'])) {
    $extensions = preg_replace('/([, ]+\\.?)/', ' ', trim(strtolower($element['#value'])));
    $extension_array = array_unique(array_filter(explode(' ', $extensions)));
    $extensions = implode(' ', $extension_array);
    if (!preg_match('/^([a-z0-9]+([._][a-z0-9])* ?)+$/', $extensions)) {
      $form_state
        ->setError($element, t("The list of allowed extensions is not valid. Allowed characters are a-z, 0-9, '.', and '_'. The first and last characters cannot be '.' or '_', and these two characters cannot appear next to each other. Separate extensions with a comma or space."));
    }
    else {
      $form_state
        ->setValueForElement($element, $extensions);
    }

    // If insecure uploads are not allowed and txt is not in the list of
    // allowed extensions, ensure that no insecure extensions are allowed.
    if (!in_array('txt', $extension_array, TRUE) && !\Drupal::config('system.file')
      ->get('allow_insecure_uploads')) {
      foreach ($extension_array as $extension) {
        if (preg_match(FileSystemInterface::INSECURE_EXTENSION_REGEX, 'test.' . $extension)) {
          $form_state
            ->setError($element, t('Add %txt_extension to the list of allowed extensions to securely upload files with a %extension extension. The %txt_extension extension will then be added automatically.', [
            '%extension' => $extension,
            '%txt_extension' => 'txt',
          ]));
          break;
        }
      }
    }
  }
}